These need a lot more contrast for the lighting to be noticeable, let alone effective. There is no evidence of perspective here. You would need to have either very large marshmallows or a very closely placed viewer for any foreshortening to be evident. The blue one overlaps the white one, though the white one appears nearer the viewer. Outlining is never going to work for something with rounded, light-diffusing edges like a marshmallow.
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